/*
   Copyright (c) 2011, 2012 Mizar Tools Contributors (mizartools.org)

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
/*  Contributors :
 *	2011-02-18 Marco Riccardi - initial implementation
 *  2012-04-06 Marco Riccardi - added message in DliParseException
 *
 */
package org.mizartools.dli;

import java.util.LinkedList;

public class Fraenkel extends Term {

	private LinkedList<Var> varList = new LinkedList<Var>();
	private Term term = null;
	private Formula formula = null;

	private Fraenkel(){
		super();
	}

	public Fraenkel(LinkedList<Var> varList, Term term, Formula formula) throws DliException {
		if (varList == null || term == null || formula == null){
			throw new DliException();
		}
		this.varList = varList;
		this.term = term;
		this.formula = formula;
    }
	
	public static Fraenkel newInstance(String string) throws DliParseException {
		Fraenkel fraenkel = new Fraenkel();
		int position = string.indexOf("(");
		if (position == -1) {
			throw new DliParseException("["+string+"] is not valid in Fraenkel");
		}
		if (!string.substring(0, position).equals("$fraenkel")){
			throw new DliParseException("["+string+"] is not valid in Fraenkel");
		}
		string = string.substring(position+1, string.length()-1);
		int positionComma = Utility.searchSeparationComma(string);
		while (string.startsWith("$var")){
			fraenkel.varList.add(Var.newInstance(string.substring(0, positionComma)));
			string = string.substring(positionComma+1);
			positionComma = Utility.searchSeparationComma(string);
			if (positionComma == -1) {
				throw new DliParseException("["+string+"] is not valid in Fraenkel");
			}
		}
		fraenkel.term = Term.newInstance(string.substring(0, positionComma));
		fraenkel.formula = Formula.newInstance(string.substring(positionComma+1));
		return fraenkel;
	}
	
	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();
		sb.append("$fraenkel(");
		for (Var var : varList){
			sb.append(var.toString());
			sb.append(",");
		}
		sb.append(term.toString());
		sb.append(",");
		sb.append(formula.toString());
		sb.append(")");
		return sb.toString();
	}
	
}
